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CVE-2025-9784

30
FAUCET Score

CVE-2025-9784 is a denial-of-service vulnerability in Undertow, affecting various Red Hat products including Enterprise Linux and JBoss EAP. Malicious clients can exploit this flaw by sending malformed requests that force server-side stream resets, leading to excessive server workload without triggering abuse counters. Rated High with a CVSS score of 7.5, this issue is easily exploitable over the network with low attack complexity, potentially causing significant availability impact. Currently, there is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:a:redhat:build_of_apache_camel_for_spring_boot:-:*:*:*:*:*:*:*
7.0.0CPE matchmatch criteria
cpe:2.3:a:redhat:fuse:7.0.0:*:*:*:*:*:*:*
7.0.0CPE matchmatch criteria
cpe:2.3:a:redhat:jboss_enterprise_application_platform:7.0.0:*:*:*:*:*:*:*
8.0.0CPE matchmatch criteria
cpe:2.3:a:redhat:jboss_enterprise_application_platform:8.0.0:*:*:*:*:*:*:*
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:a:redhat:jboss_enterprise_application_platform_expansion_pack:-:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.17%
Probability of exploitation in next 30 days
EPSS Percentile
80.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0217 is in the 65th percentile among its peer group of 51,485 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (13)

mavenpatch availablevia ghsa
Product: io.undertow:undertow-coreFixed in: 2.2.38.Final
mavenpatch availablevia ghsa
Product: io.undertow:undertow-coreFixed in: 2.3.20.Final
redhatpatch availablevia redhat_api
Product: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9Fixed in: eap8-undertow-0:2.3.20-2.SP4_redhat_00001.1.el9eap
View patch
redhatpatch availablevia redhat_api
Product: Red Hat build of Apache Camel 4.14.2 for Spring Boot 3.5.8Fixed in: undertow-core
View patch
redhatpatch availablevia redhat_api
Product: Red Hat JBoss Enterprise Application Platform 8.1Fixed in: undertow-core
View patch
redhatpatch availablevia redhat_api
Product: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8Fixed in: eap8-undertow-0:2.3.20-2.SP4_redhat_00001.1.el8eap
View patch
redhatvendor investigatingvia nvd_reference
View patch
redhatno patchvia redhat_api
Product: Red Hat JBoss Enterprise Application Platform 7Fixed in: undertow-core
redhatno patchvia redhat_api
Product: Red Hat JBoss Enterprise Application Platform Expansion PackFixed in: org.jboss.eap-jboss-eap-xp
redhatno patchvia redhat_api
Product: Red Hat Process Automation 7Fixed in: undertow-core
redhatend of lifevia redhat_api
Product: Red Hat Data Grid 8Fixed in: undertow-core
redhatend of lifevia redhat_api
Product: Red Hat Fuse 7Fixed in: undertow-core
redhatend of lifevia redhat_api
Product: Red Hat Single Sign-On 7Fixed in: undertow-core

Vendor Advisories (2)

mavenGHSA-95h4-w6j8-2rp8high

Undertow MadeYouReset HTTP/2 DDoS Vulnerability

Sep 2, 2025
redhatCVE-2025-9784Important

undertow: Undertow MadeYouReset HTTP/2 DDoS Vulnerability

Sep 1, 2025

References

kb.cert.org / vuls/id/767506
access.redhat.com / errata/RHSA-2025:23143
access.redhat.com / errata/RHSA-2026:0383
access.redhat.com / errata/RHSA-2026:0384
access.redhat.com / errata/RHSA-2026:0386
access.redhat.com / errata/RHSA-2026:33371
access.redhat.com / errata/RHSA-2026:33372
access.redhat.com / errata/RHSA-2026:3889
access.redhat.com / errata/RHSA-2026:3891
access.redhat.com / errata/RHSA-2026:3892
access.redhat.com / errata/RHSA-2026:4915
access.redhat.com / errata/RHSA-2026:4916
access.redhat.com / errata/RHSA-2026:4917
access.redhat.com / errata/RHSA-2026:4924
access.redhat.com / security/cve/CVE-2025-9784
Vendor Advisory
bugzilla.redhat.com / show_bug.cgi
Issue Tracking
github.com / undertow-io/undertow/pull/1778
github.com / undertow-io/undertow/releases/tag/2.2.38.Final
issues.redhat.com / browse/UNDERTOW-2598
kb.cert.org / vuls/id/767506